Euphorbia help please

I have a group of three euphorbia and they are all not looking well. Any ideas please. I have a single one growing about four metres away(same conditions) and it's very healthy. I hope you can enlarge the photo cos I can't seem to manage it.
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Oh it worked?
Last edited: 07 August 2017 23:24:28
Looks like it could be E. blackbird, in which case it needs full sun to give the nice dark leaves.
When you don't even know who's in the team
S.Yorkshire/Derbyshire border